This STANLEY® FATMAX® Snap-Off Knife has a built-in mechanism which is designed to allow for simpler and safer operation. There is no need to use secondary tools to break and remove the snap-off blade – simply line up the blade with the indicator line, release the lock and push over the built-in blade snapper and continue cutting with a fresh new sharp edge. For added convenience, the knife retains the blade once it's snapped with an integrated magnet.